question regarding R, RCS, or OCS (?)

[Jules Levin]

I occasionally worship in a synagogue that offers, optionally,
a Russian-Hebrew bilingual prayer book in addition to the usual
English-Hebrew or all Hebrew prayer books.
I have noticed that a Hebrew phrase translated into English as
Holy of Holies appears in the Russian as "svjataja svjatyx".   Trouble
is, it appears this way in a sentence that requires the Locative,
or possibly the Accusative:  "...vosstanovi v svjataja svjatyx... "
The object of the Adj is masculine in Hebrew, but what word would it be
in Russian, if fem.?  [I realize this is really another problem, but perhaps
it is a clue....]
Can someone elucidate here?
If your only explanation is less than total competence in Russian, don't
be shy; it is conceivable in this translation.
Jules Levin  

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